HP8568B__SetActiveInput (ul_pbar_instruments)

 *  Synopsis:
 *    #include <ul_pbar_instruments:hp8568b.h>
 *
 *    HP8568B__SetActiveInput( const CHP8568Bptr hp8568BPtr,
 *                             const EINPUTNnumber input )
 *
 *  Function intent:
 *    HP8568B__SetActiveInput() selects the currently active instrument input.
 *  Function parameters:
 *    EINPUTNnumber	input		HP8568B input to be read:
 *					  kInput1 <= input <= kInput2
 *  Function return value:
 *    CBS_OK		Setup was successful
 *    CLIB_INVARG	Invalid parameter value
 *    CLIB_GENERR	Unable to write HP8568B command
 *    CLIB_INVALID_DATA	HP8568B status error after GPIB command